Question: How Does Change In The Length Of Antenna Affects Reading Distance?

Does the length of an antenna matter?

So the answer is yes, size does matter, but bigger isn’t always better.

It all depends on what your transmitting and receiving frequencies are.

Theoretically, a longer antenna will have a greater range, but it is far more important for optimal radio performance that the length of the antenna matches the frequency..

How far will a 9dBi antenna reach?

Antenna BasicsAntennaTypeMax Range9dbiOmni directional1200ft9dBi PanelDirectional.25 miles11dBiOmni directional.25 miles14dbiOmni directional.4 miles10 more rows

How long should my antenna be?

An antenna – usually 1/2 wavelength long – split at the exact center for connection to a feed line. Dipoles are the most common wire antenna. Length is equal to 1/2 of the wavelength for the frequency of operation.

What is the highest dBi Antenna?

This powerful 2.4 GHz dipole antenna has a whopping 22 dB of gain. This is one of the most powerful omni-directional dipole antenna available.

How do you calculate electrical length?

To calculate the electrical length of the line you need to multiply the velocity factor of the line (available from the supplier of the line) by the free space length. For the length in feet, this is (983.6 / frequency in MHz) * velocity. For the length in meters, this is (299.8 / frequency in MHz) * velocity.

How can I reduce the size of my antenna?

by immersing the antenna in a dielectric the size of the antenna can be reduced to a very large extent… given by length = lambda/ε…. ε permittivity of dielectric medium…

What is electrical length of antenna?

ELECTRICAL LENGTHS AND ACTUAL LENGTHS OF ANTENNAS An ideal antenna, one completely free from the influence of the earth, would have an ACTUAL LENGTH exactly equal to its ELECTRICAL LENGTH. For instance-an ideal half-wave antenna for use with a 100-meter wavelength would be 50 meters long.

Is a higher dBi Antenna better?

The higher the dBi number of the antenna, the higher the gain, but less of a broad field pattern, meaning that the signal strength will go further but in a narrower direction, as illustrated in the diagram below.

Why is AM radio reception so bad?

If the battery operated radio reception is good, interference could be caused by the mains power – check the power cord is well insulated. If both radios are affected, the problem is likely to be electrical interference to the antenna, caused by a nearby electrical appliance.

What is a 1/2 wave antenna?

The size of an antenna is directly related to the wavelength of the frequency to be received. … The size of a 1/4-wave antenna is approximately one-quarter of the wavelength of the desired frequency, and the 1/2-wave is one-half the wavelength.

Can you use a TV antenna for AM radio?

The loop antenna inside your clock radio will work better on AM than a TV antenna. If you really want to improve AM reception you could get a Select-a-tenna; it’s basically a large AM loop antenna inside a round plastic box.

What are the disadvantages of loop antenna?

Following are the disadvantages of Loop Antenna: ➨Small loops have poor efficiency and hence are mainly used as receiving antenna at lower frequencies. ➨Small loop antennas have very low value of radiation resistance. This results into power loss as heat due to flow of current with high levels.

What is the range of 5dBi antenna?

about 500 metersThis antenna would typically replace standard 2dBi antennas, which are normally shipped with this class of wireless device, in order to increase the range and/or expand the coverage area. With this 5dBi antenna, theoretically a distance of about 500 meters can be covered.

How do I increase electrical antenna length?

(Phase shift in degrees/360)*λ = cable physical length … Here Phase shift in degrees is the electrical length. So, if you want to change the electrical length of antenna, you can change the velocity factor or dielectric properties which is specific to the material used in antenna.

What is electrical distance?

[i′lek·trə·kəl ′dis·təns] (electromagnetism) The distance between two points, expressed in terms of the duration of travel of an electromagnetic wave in free space between the two points.

Can an antenna be too long?

So, long story short, too much antenna can be a problem, those problems can be ameliorated but it may be easier to keep the antenna matched to the receiver.